Curtis and Gullett (7) developed an equation correlating the effect of velocity, concentration and particle size on apparent viscosity of non-Newtonian water slurries.

μ/μ_w=1.02(AK/GC)^.105

The object of this paper was to determine the validity of using the viscosity, as determined by the Curtis-GulLett (7) equation, in predicting the heat transfer coefficient of non-Newtonian fluids, where the suspending medium is something other than pure water . The authors used various concentrations of sugar solutions as the dispersion medium, for the slurries.

A dimensionless equation resembling the flittusBoelter equation with modified exponents and additional dimensionless groups has been developed by J.J. Salamone (14):

HD/K_f=^.131(DV_bP_b/ μ_b)^.62(C_s/C_f)^.35(C_fμ_b/K_f)^.72(D/D_s)^.05(K_s/K_f)^.05

Franks and Rinaldi (8) found the magnitude of the exponents to be as follows:

HD/K_f=^.0138(DV_bP_b/ μ_b)^.8(C_s/C_f)^.42(C_fμ_b/K_f)^.79(D/D_s)^.106(K_s/K_f)^.05

Experimentally determined heat transfer coefficients deviated from the values calculated by the Franks and Rinaldi (8) equation by 16%.

This is what was expected, since the Curtis and Gullett (7) equation is accurate to 14.4%, the authors of this paper feel this equation may be used to obtain the viscosity of a slurry in predicting the magnitude of the heat transfer coefficient.

The authors feel that a sufficient amount of experimental data has been obtained in determining the validity of the Franks and Rinaldi(8) equation for predicting heat transfer coefficients of' non-newtonian fluids, but additional work of a statistical nature is recommended in re-evaluating the exponents of the Franks and Rinaldi(S) equation. in the light of all available data. Closer agreement between experimental and calculated values for heat transfer coefficients would result.